Those who want to experience the history-packed Institute of Texan Cultures (ITC) before it leaves its original downtown site have one more chance. The University of Texas at San Antonio, which serves as custodian for the 56-year-old museum, will hold a free open house from 10 a.m. to 4 p.m. Friday to give visitors once more chance to tour the site, which was built as part of HemisFair in 1968.